John Lewis Gaddis' acclaimed history of U.S. policy toward the Soviet Union during and immediately after World War II is now available with a new preface by the author. This book moves beyond the focus on economic considerations that was central to the work of New Left historians, examining the many other forces -- domestic politics, bureaucratic inertia, quirks of personality, and perceptions of Soviet intentions -- that influenced key decision makers in Washington, and in doing so seeks to analyze these determinants of policy in terms of their full diversity and relative significance.